Seven or more alternating green and amber blinks often indicate a waste ink error.
Before the Service Tool can communicate with your MB2140, the printer must be in a special "Service Mode." Without this, the software will not recognize the device. YouTube·thecollegepicker Canon Mb2140 Service Tool
This utility is an official-style software designed for technicians to perform deep maintenance tasks that are not available in the standard user menu. For MB2140 owners, its primary use is clearing the waste ink (absorber) counter after the hardware has flagged it as full. When Do You Need This Tool? Seven or more alternating green and amber blinks